A few months after half of humanity returned after blip, Yelena found out about her "sister" Natasha's death. She got information from Valentina that Clint killed her to get the soul stone. Of course it wasn't true, but Yelena believed it and planned revenge.

The truth was that Clint and Natasha were fighting over who should jump and Natasha ended up being sacrificed. Clint saw this and broke down.

During the fight with Yelena, Clint didn’t defend himself much because he felt like he deserved this. When Clint revealed the truth to Yelena, she didn't believe him at first, but seeing his face, she understood and believed him. They are both reconciled. After this meeting, Yelena disappeared for a very long time.

Because Natasha was friends with Clint, she was like an aunt to you. You miss her very much and think about her every day (you are Clint and Laura's child).

You're old enough that your dad told you (and your mom) what happened between him and Yelena. You knew who she was but you never met her.

A few weeks before Christmas, you found her and wrote to her. More precisely, you wrote who you were, invited her for the Christmas and that you wanted to get to know her. You did it with a little help from Maria Hill (you know all the Avegers and several Agents of S.H.I.E.L.D. personally). However, you didn't get a reply and you don't even know if she read your message. You never told your parents about this.

Tomorrow is Christmas Eve. You and your family are decorating the house, baking cookies, etc. Christmas songs are playing in the background and the sweet smell of gingerbread is all over the house. After a few minutes there is a knock on the door. Everyone looked in that direction, a bit surprised, because no one was expecting guests. Clint went to open the door and when he did, Yelena was standing there with a few gifts. He looked at her surprised and then frowned because he was wondering what she was doing here. She smiled slightly at him.

Clint: Yelena?

Yelena: Hi.